Bolt-cutting machine



(No Model.) 2 Sheets -Sheet 1.

E. GOLDTHWAIT. BOLT CUTTING MACHINE No. 432,033. Patented Julj 15, 1330.

IJV' VEJV TOR NITED STATES PATENT Trice".

EVERETT GOLDTHWVAIT, OF ELKHART, INDIANA.

BOLT-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 432,033, dated July 15, 1890. Application filed March 14, 1889. Serial No. 303,226. (No model.)

To all whom it may concern.-

Be it known that l, EVERETT GOLDTHWAIT, a citizen of the United States, residing in Elkhart, county of Elkhart, State of Indiana, have invented a new and useful Improvement in Bolt-ll1reading Machines, of which the following is a specification.

My invention relates to bolt-threading machines having cutting-dies which are closed on the bolt bya sliding die-ring and withdrawn from the bolt as the die-ring recedes.

The chief object of my invention is to provide improved mechanism for automatically withdrawing the dies from the bolt and improved adjusting devices for regulatin the depth of thread to be cut.

The said invention consists in the construction and combination of devices hereinafter set forth and claimed.

In the accompanying drawings, Figure 1 represents a side elevation of a machine embodying my invention. Fig. 2 represents an enlarged side elevation of the diehead, the

die-ring having been removed. Fig. 3 represents a longitudinal vertical section of the same, the die-ring being in place; and Fig. 4 represents an end elevation of the dichead and ring.

A designates the die-head, having a journal A extending rearwardly therefrom. This journal is tubular, having a longitudinal bore A, and turns in a frame indicated by dotted lines in Fig. 1. .As there is no noveltyin the construction of this f 'ame, I have not illustrated it more fully; also, it might obscure some of. the working parts which I desire to show. I have marked this frame A. This tubular journal or shaft 'A is driven by any convenient gearing. The die-head A turns with this journal or shaft A, and the two are preferably integral, as shown. This die-head is recessed to receive the verticallymovable cuttingdies D, which play in radial slots formed in the face of the head A, (shown in Fig. 3, Sheet 2,) and are held in place by the plate E. The circumferential surface of the head A is provided with similar slots running longitudinally along this surface, and they are a continuation of the slots in the end face of the head receiving the dies I)". In these slots are placed the dielifting dogs D, one end pivoted to the diehead A with the pivot S. The other ends of said dogs Dare provided with the notch 8", which receives a hook D", formed by a corresponding notch D in the upper end of die D". These dogs are for the purpose of raising and lowering the cutting-dies D, which work freely in the slots formed in the head.

Beneath the dogs I), and just in the rear of the cutting-dies D", are the springs D', which are for the purpose of automatically raising the said dies and elevating the free ends of the dogs D in relation to the pivoted end, so thatthe backs will normally form an inclined plane with die-head A and die-ring B. If desired, the backs of the dogs can be made wedge-shaped, which will form inclined planes without the aid of the springs. In such a case the dutyof the springs will be to only automatically raise the cuttingdies D. Outside of the die-head A, and covering the inclined backs of the pivoted dogs, is the diering B, having slots formed therein corresponding with the slots in the head for permitting the upward movement of the dogs. This ring revolves with the die-head, but has a horizontal movement over the backs of the dogs D for operating them by moving over the incline planes formed by their backs, which causes the dies D to play up and down in the slots toward the center when the belt is being cut and withdraw after the bolt has been cut. The closing of the dies is accomplished through the forward movement of the ring B by the hand-lever ll. Said lever is mounted on a short shaft H and turns there with. This shaft is provided with a bellerank lever, also fast thereon, and having arms K K. The arm K is connected by a link or bar K with a strap or yoke 13, fitting into a circular groove. The said strap or yoke is circular, to correspond to the shape of the die-ring and groove. It is connected to the proximate end of link K" by a stud,

which allows pivotal" motion, formed in the die-rings, so as to permit the head and diering B to revolve. The automatic releasing of the bolt is caused through the gravitating weight I suspended to the lever H through the arm K; It will be seen the openin g of the dies is done automatically through the gravitating of weight K and the action of the springs D.

The graduating of the cutting-dies D to suit the different-sized bolts to be cut is done by means of the die-ring 13" moving over the inclined backs of the dogs D, springs and hand-lever H. This lever is held in the desired position to suit the different diameter of the bolts to be cut by the device N having the threaded end, and nuts M, for raising and lowering it to meet the position of the handlever H and opening of the cutting-dies D". The said nut is fixed, except as torotary motion, being suitably secured to an attachment of the frame of the machin e. The screw-threaded shank N of lever-holding device N passes through said nut in engagement therewith, and is raised or lowered by the rotation of the latter. The device N is provided with a pivotal catch or (log N which is forced by a spring S into locking engagement with a lug II on the lever H, so as to hold down the handle end of said lever.

The length of the thread to be cut is gaged by means of the movable graduating-rod R, attached to the bolt-gripping carriage \V and held by the thumb-nut I As the carriage moves horizontally in feeding the bolt to the cutting dies, the downward-projecting end R of the rod R comes in cont-act with the dog N carrying said dog with it, compressing the springs S, releasing the hand-lever H, and the weight K', descending, moves the (lie'ring l3 baclnvard over the inclined backs of the dogs D, allowing the springs D' to automatically open the cutting-dies D and releasing the belt.

I am not confined to any special number of dies nor operating-levers or graduating devices. I simply show this arrangement to illustrate the operation of the invention. As the drawings show the invention quite clearly, a further description will not be necessary.

I am aware that prior to my invention boltcutting die-heads have been made to carry a series of opening dies that are operated by a die-ring and incline planes or ways, and the (lies playing up and down into slots formed in the heads, and the dies being contracted through the medium of such die-ring. I therefore do not claim this combination and arrangement, broadly; but

What I do claim, and desire to secure by Letters Patent, is-

1. In a bolt-threading machine, the combination of a rotary die-head and the cuttingdies movable therein toward and from the bolt with the sliding die-ring and inclined dogs for forcing said dies more or less inward, according to theamount of sliding motion of said ring, a lever and intervening connections for causing the sliding motion of said ring, a catch engaging with said lever to lock it in any chosen position, a bolt-carriage arranged to release said lever from said catch in the act of feeding the bolt, and a nut and screwthreaded shank for adjusting said catch, so that the point of vertical position at which said lever will be locked by said catch may be varied, as described.

2. In a bolt-threading machine, the combination of a die-head, cutting-dies movable therein, inclined dogs engaging with said dies, a die-ring depressing said dogs and dies more and more as it slides forward, a lever for moving said ring forward, arms K K, rocking with said lever, the weight K hung from arm K, and connections between arm K and the die-ring, in order that said weight may retract said die-ring, substantially as set forth.

3. In combination with the die-head of a bolt-threading machine, the cutting-dies radially movable therein, the inclined dogs pivoted to said head and having notches to receive hooks on the outer ends of said dies, the springs D, forcing said dogs outward, the die-ring movable over said head to depress said dogs and cutting-dies, and a lever and connections for operating said die-ring, the said head being recessed to receive said cutting-dies, dogs, and springs, substantially as set forth.

In testimony that I claim the foregoing I 

